Angular momentum mass flowmeters

Post-Oil Energy Technology After the Age of Fossil Fuels 

Another angular momentum mass flowmeter was attempted using the principle of a gyroscope. It consisted of a pipe shaped in the form of a circle formed in a plane perpendicular to the direction of the process flow. If this pipe is oscillated around one axis, a precession-type moment is produced about the axis perpendicular to it, which is proportional to mass flow. The gyroscopic mass flowmeter can handle slurries in medium pressure and temperature ranges, but its industrial use is very limited because of its high cost and inability to handle high flow rates. 

---

Axial-Flow Transverse-Momentimi Mass Flowmeter This type is also referred to as an angular-momentum mass flowmeter. One embodiment of its principle involves the use of axial flow through a driven impeller and a turbine in series. The impeller imparts angular momentum to the fluid, which in turn causes a torque to be imparted to the turbine, which is restrained from rotating by a spring. The torque, which can be measured, is proportional to the rotational speed of the impeller and the mass flow rate. 

Mass reaction or momentum flowmeters are of three types. There are those in which an impeller imparts a constant angular momentum to the fluid... 

---